Case History: ISR-1100 (Iron Sulfide Removal) and PA-721 (Paraffin/Asphaltene System)

Date: April 16, 2013

Customer: Major Independent with subject well located in Madison County Texas.

Pertinent Well Data:

Formation: Woodbine (Sandstone)

Perfs: 8,421’-8,427’

Tubing: 2-7/8” 

Casing:  4-1/2” 

Other Data: Bottom Hole Temperature @ 165˚F


This well had very little to not flow. Treated to remove iron sulfide and formation damages. ISR-1100 Series is an anionic surfactant package that is low in pH and is designed to break iron sulfide down into small particulates, making for easier removal when acidizing or flowing back. PA-721 System is a blend of aromatic solvents combined with penetrants and dispersants designed for the removal of heavy paraffin/asphaltene deposits as well as heavy hydrocarbon based sludge

Production Estimates Prior to Last Work-over:

Gas:  14 MCFD

Oil: 6 BOPD

Water: 15 BWPD

Production Estimates After Work-over:

Gas:  75 MCFD

Oil: 32 BOPD

Water: 34 BWPD


Recommendations & Procedure: [testing recommended prior to all jobs]

MGM Northstar provided and pumped the following system as outlined below:

  1. Treated down annulus
  2. Flushed with 10 bbls of KCL water to clear lines

*Shut-in times of 12 hours.


Well production improved.


ISR-1100 Series is recommended at a loading of 25 to 75 gallons per foot of desired treatment area. Volumes may change based on the severity of the damage and desired penetration in and into the formation. It is also suggested that samples be taken when possible as to ensure the most optimum performance and cost effectiveness.

PA-721 System is recommended depending on the severity of damage and type of application. Samples should be obtained to determine that each individual well has the proper loading This method is used to remove any hydrocarbons that may be plating out on the formation, thus preparing the formation face so that optimized performance can be expected from the acid and/or fracturing stimulation procedure.